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"A roof replacement or repair cost will be different than a new..."

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Commercial roofing costs in Southern California vary from contractor to specialist. A roof replacement or repair cost will be different than a new installation as well. Since it is a commercial building, I will assume that it is a flat roof with no pitch? The biggest thing about SoCal is the heat. So you will need a roof than will withstand the constant sun damage. Before you call around for an estimate, make sure all the roofers you call can produce a Certificate of Insurance. Read that policy and make sure it is currently active and in force. Remember, you don`t want just a cheap roof as it will turn out to be the most expensive in the long run after you run into problems with it. So, look for quality, craftsmanship and reputation from bonded contractors before you focus only on price. Make sure they are a member of the roofing contractors association of southern California as well. (http://www.rcasocal.org/). Poly foam is good on flat roofs because of its heat reflection ability, so look into that product. Depending on the size of your building, you can pretty much expect that your roof replacement will cost about $20K to 30K if you want it to last 20 years.

" cost per square foot for a flat roof though is not higher...."

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That is a good question. I would have thought that a flat roof would be much easier to install than a roof with a pitch. Truly, a flat roof is the most cost-efficient type of roof you can get, but since nobody gets this for residential in the United States, and the only buildings getting flat roofs are usually commercial and retail buildings, then the total cost of a roofing job is more. Contractors are going to charge commercial building a lot more and since the surface area is greater they have more material to transport and install. Cost per square foot for a flat roof though is not higher.

"Average roofing costs vary from 40 to 100 per square foot..."

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Average roofing costs vary from 40 to 100 per square foot. It is cheaper if you have a one story house with a low pitch roof and more if your house is a two-story with a higher pitch (slope). Asphalt shingles cost the least and only last about 15 to 20 years. Metal roofing and concrete tiles cost more and, of course, last longer. Call a roofing company over to give you an estimate. Actually, call three roofing companies and get 3 estimates.

"On average an asphalt roof will cost you between 50 and 100 per square (10x10..."

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On average an asphalt roof will cost you between 50 and 100 per square (10x10) installed. Depending on the warranty of the specific shingle you choose, the price can vary according to quality. Also, be sure to choose a installer or contractor that is bonded and has current insurance. A cheap roof often becomes an expensive roof when you try to save money and cut corner. Look up licensed roofing contractors in your area and ask them to come out for a free estimate.

Someone said: No licensed contractor will install at 50/100 per square you have no idea what you are talking about a square of shingles low end is 250/300 installed mid grade 350/400 installed and premium 500/700 don`t quote prices you no nothing about licensed contractor over 30 years

"So you should expect it to cost you anywhere from $4 per square..."

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If you`re looking to replace a commercial roof, I would assume you will be going with an industrial flat roofing material, since these roofs are most popular for non-residential buildings. Flat roofs have come down in price and are more affordable than before, so you should expect it to cost you anywhere from $4 per square foot to $12 per sq for materials and expert installation.

"An average roof for an average sized house..."

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An average roof for an average sized house, you mean? A normal roof with a typical roof pitch and run of the mill shingles would cost 5,000 and up. But, you need to consider the long term costs. If you spend less now, you may have to replace and repair the roof sooner than you would have liked. Sometimes, it`s better to get a solid and more expensive 30 year roof and pay more upfront, rather than a cheaper roof with a cheap asphalt shingle that will only last 8 years or so.

"Then you can expect steel shingles to cost about 6$ per square..."

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The average cost of a commercial roofing job depends on materials used and labor costs. If the job is big, then you can expect steel shingles to cost about 6$ per square foot and steel flat roof sheeting to cost about 3 times the cost of asphalt shingles which go for anywhere from 2 to 4 per square foot.

"Brother the average rough cost for you to replace..."

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Brother the average rough cost for you to replace the roof is actually about 2$ per square foot. you can easily find out the number of the square foot easily by the formula. and then you can multiply that with the 2$ per square foot to get the actual cost of the roof rebuilding.

"So determine how many squares you will need (a flat roofing..."

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Commercial flat roofs are priced at $600 per square (10-x10), so determine how many squares you will need (a flat roofing contractor can measure this for you) and you`ll know how much the project will cost. For example, 50 squares will cost you about $30000 to finish a roof.

"How steep the roof..."

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Depends on where in the country. How steep the roof. What type of roof. Is it a reroof or new construction? Reroof on a roof the is walkable.... About $200.00 @ Sqft -. But here again, many variables. Good luck.

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